Error In Page

Error Message: Cannot find ContentPlaceHolder 'headContentHolder' in the master page '/MasterCal_Public/MasterCalendarMaster.master', verify content control's ContentPlaceHolderID attribute in the content page.

Stack Trace:
System.Web.HttpException (0x80004005): Cannot find ContentPlaceHolder 'headContentHolder' in the master page '/MasterCal_Public/MasterCalendarMaster.master', verify content control's ContentPlaceHolderID attribute in the content page.
at System.Web.UI.MasterPage.CreateMaster(TemplateControl owner, HttpContext context, VirtualPath masterPageFile, IDictionary contentTemplateCollection)
at System.Web.UI.Page.get_Master()
at System.Web.UI.Page.ApplyMasterPage()
at System.Web.UI.Page.PerformPreInit()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Additional Information
ErrorCaughtBy: Login.aspx
PatchNumber: 201805210
ClientName:
Product: